* Add command palette and quick open dialog
* Fix format and paragraph commands
* Adjust style and allow to reset list/quote
* Adjust UI and fix some issues
* Add custom placeholder
* Prepare for drag and drop row and column
* remove regexp th|td
* render drag button
* Feat: support drag and drop row and column of table
* Feat: table bar tools
* remove unnecessary codes
* Feat: support select multiple cells
* Do not show table drag bar when selected cells
* Feat: support delete selected cells content or remove row/column/table
* Feat: select one cell or table when press ctrl + a
* Support select all content
* Remove table tools in context menu
* Feat: support copy paste selected cells as sub table
* Fix: PR issue 1 press tab will not show the table drag bars
* Select one cell and press backspace will cause bug
* Fix: The table drag bar location error when there are tow tables in the editor
* Fix unable copy and paste 1* n or n * 1 table
* Drag any row to the top to editor will cause error.
* Update table resize icon
* Fix: table resize is not work in table tool bar
* Fix: No need to show left drag bar if only one row, and no need to show bottom drag bar if only one column.
* Fix: Create an empty table in source code mode, turn to preview mode, there are more than two drag bars in one table.
* Fix: resize table
* Opti: table is not 100% width now
* Fix drag in one row or column
* Change table delete icon
* Fix: backspace is not work
* Little style opti
* Fix: cmd + enter bug
* Update the table drag bar context menu text
* Handle delete key when select table cells
* remove all unnecessary debug codes
* Feat: support cut selected cells and copy/cut by context menu
* Fix typo
* Rename some methods name
* Fix an issue when drag and drop table drag bar
* fix do not handle cell selection when the context menu shown
* Do not handle select cells when mouse up outside table
